triangle ABC

[tik]

triangle ABC has verticals A(1,2,3), B(-5, -10, -9), C(-4,3,6). find the measurement of angle ABC

 

[pka]

triangle ABC has verticals A(1,2,3), B(-5, -10, -9), C(-4,3,6). find the measurement of angle ABC

Did you read the forum's rules? You should post some effort.

​\(\displaystyle m\left( {\angle ABC} \right) = \arccos \left( {\dfrac{{\overrightarrow {BA} \cdot \overrightarrow {BC} }}{{\left( {\left\| {\overrightarrow {BA} } \right\|} \right)\left( {\left\| {\overrightarrow {BC} } \right\|} \right)}}} \right)\)

 

[mmm4444bot]

triangle ABC has verticals A(1,2,3), B(-5, -10, -9), C(-4,3,6). find the measurement of angle ABC

The correct noun is vertices (plural of vertex). The noun verticals means something else.

Also, here is a link to the summary page of our posting guidelines. Please read this information, before posting again. (Links to the complete guidelines and the forum rules appear on that page.)

Thank you! :cool: